iter50-卡2：卡B(断言补齐): 四域13新断言+2处既有扩展——①增益结算链V1-V5 ②设置存储V6-V8 ⑤Boss门控V9/V10 ⑥锻造V11-V16; 新件settings_store_test与boss_gate_test; manifest+2; 73套件全绿

game/tests/unit/contracts/system_contracts_test.gd

@@ -29,6 +29,10 @@ func _init() -> void:
 		_test_status_grant_all_per_unit(db)
 		_test_status_death_clears(db)
 		_test_status_merge_per_unit(db)
+		_test_status_decay_and_clear(db)
+		_test_status_stack_full_reject(db)
+		_test_status_independent_branch(db)
+		_test_status_snapshot_first_grant(db)
 	quit(Kit.finish("system_contracts_test"))
 
 
@@ -209,3 +213,81 @@ func _test_status_merge_per_unit(db) -> void:
 			granted_n += 1
 	Kit.check("同体合并照旧：叠加行满层拒绝（恰授 max_stack=%d 层）〔个体化批 V4〕" % max_stack, granted_n == max_stack)
 	Kit.check("同体合并照旧：满层时异体仍受理（拒绝只在同体内原子）〔个体化批 V4〕", effects.apply_effect("enrage", "e3", src) == true)
+
+
+# ---- B4 结算链契约（断言补齐批——①增益状态结算链）：衰减逐值/战斗结束全清/满层拒绝/独立并存/首授快照 ----
+
+func _test_status_decay_and_clear(db) -> void:
+	var effects = StatusContainerScript.new(db)
+	effects.notify_battle_start()
+	var src := {"source_class": "seal_hit", "origin_cell": Vector2i(-1, -1), "round_index": 0}
+	var wrow: Dictionary[Variant, Variant] = db.combat.status_effects.row_by_id("weaken")
+	var w_dur: int = int(wrow.duration_settlements)
+	Kit.check("V1 前置：weaken 时长 ≥2（两拍衰减观测面）", w_dur >= 2)
+	Kit.check("V1 前置：e1 受理", effects.apply_effect("weaken", "e1", src))
+	Kit.check("衰减逐值：首次 decay 返回移除数 0（未归零）〔断言补齐批 V1〕", effects.decay_round() == 0)
+	Kit.check("衰减逐值：每结算恰 −1（remaining=%d−1）〔断言补齐批 V1〕" % (w_dur - 1),
+		effects.query_active("e1").size() == 1 and int(effects.query_active("e1")[0].remaining_settlements) == w_dur - 1)
+	Kit.check("到期移除：第二次 decay 返回移除数 1〔断言补齐批 V2〕", effects.decay_round() == 1)
+	Kit.check("到期移除：归零实例当轮销毁（投影零行）〔断言补齐批 V2〕", effects.query_active("e1").is_empty())
+	effects.apply_effect("weaken", "e2", src)
+	effects.apply_effect("attack_up", StatusContainerScript.OWNER_HERO, src)
+	Kit.check("V2 前置：两桶各持实例", effects.query_active_side("enemy").size() == 1 and effects.query_active(StatusContainerScript.OWNER_HERO).size() == 1)
+	Kit.check("战斗结束全清：notify_battle_end 返回 true 且全实例清空（两桶零行）〔断言补齐批 V2〕",
+		effects.notify_battle_end() and effects.query_active_side("enemy").is_empty() and effects.query_active(StatusContainerScript.OWNER_HERO).is_empty())
+
+
+func _test_status_stack_full_reject(db) -> void:
+	var effects = StatusContainerScript.new(db)
+	effects.notify_battle_start()
+	var src := {"source_class": "seal_hit", "origin_cell": Vector2i(-1, -1), "round_index": 0}
+	var erow: Dictionary[Variant, Variant] = db.combat.status_effects.row_by_id("enrage")
+	var max_stack: int = int(erow.max_stack)
+	for i in range(max_stack):
+		effects.apply_effect("enrage", "e1", src)
+	Kit.check("V3 前置：满层（恰 %d 层）" % max_stack,
+		effects.query_active("e1").size() == 1 and int(effects.query_active("e1")[0].layers) == max_stack)
+	var before_layers: int = int(effects.query_active("e1")[0].layers)
+	var before_rem: int = int(effects.query_active("e1")[0].remaining_settlements)
+	Kit.check("满层拒绝：再授返 false〔断言补齐批 V3〕", effects.apply_effect("enrage", "e1", src) == false)
+	Kit.check("满层拒绝：层数与剩余零写入（容器逐字不变——原子拒绝）〔断言补齐批 V3〕",
+		int(effects.query_active("e1")[0].layers) == before_layers and int(effects.query_active("e1")[0].remaining_settlements) == before_rem)
+
+
+func _test_status_independent_branch(db) -> void:
+	var effects = StatusContainerScript.new(db)
+	effects.notify_battle_start()
+	var probe := {
+		"effect_id": "probe_independent_v4",
+		"display_name": "并存试验",
+		"target_side": "enemy",
+		"magnitude": 7,
+		"unit": "flat",
+		"duration_settlements": 2,
+		"stack_policy": "independent",
+		"max_stack": 1,
+	}
+	db.combat.status_effects.rows.append(probe)   # 直改已加载表（运行时注入试验行——并存分支零内容行，夹具面）
+	var src := {"source_class": "seal_hit", "origin_cell": Vector2i(-1, -1), "round_index": 0}
+	Kit.check("independent 并存：第一次授予受理〔断言补齐批 V4〕", effects.apply_effect("probe_independent_v4", "e1", src))
+	Kit.check("independent 并存：第二次授予受理（并存——无合并无满层语义）〔断言补齐批 V4〕", effects.apply_effect("probe_independent_v4", "e1", src))
+	var both: Array = effects.query_active("e1")
+	Kit.check("independent 并存：两实例各持时长 2 独立倒数〔断言补齐批 V4〕",
+		both.size() == 2 and int(both[0].remaining_settlements) == 2 and int(both[1].remaining_settlements) == 2)
+	db.combat.status_effects.rows.pop_back()   # 测毕还原（表行零残留）
+	Kit.check("independent 试验行测毕还原（row_by_id 零命中）", db.combat.status_effects.row_by_id("probe_independent_v4").is_empty())
+
+
+func _test_status_snapshot_first_grant(db) -> void:
+	var effects = StatusContainerScript.new(db)
+	effects.notify_battle_start()
+	var src_first := {"source_class": "seal_hit", "origin_cell": Vector2i(3, 4), "round_index": 1}
+	var src_second := {"source_class": "mine_hit", "origin_cell": Vector2i(8, 9), "round_index": 5}
+	effects.apply_effect("weaken", "e1", src_first)
+	effects.apply_effect("weaken", "e1", src_second)   # 累加：时长加、归因与快照沿首授
+	var inst: Array = effects.query_active("e1")
+	Kit.check("首授快照：累加合并仍单实例〔断言补齐批 V5〕", inst.size() == 1)
+	Kit.check("首授快照：origin_cell/round_index/source_class 沿首授（合并实例只持首授归因）〔断言补齐批 V5〕",
+		String(inst[0].source_class) == "seal_hit" and inst[0].origin_cell == Vector2i(3, 4) and int(inst[0].round_index) == 1)
+	Kit.check("首授快照：幅度快照 = 首授时表值（抗热重载域）〔断言补齐批 V5〕",
+		int(inst[0].snap_magnitude) == int(db.combat.status_effects.row_by_id("weaken").magnitude))